"code": "CompanyTaxProfileEntryRequired",
	"target": "Unknown",
	"details": [
			"code": "CompanyTaxProfileEntryRequired",
			"number": 1902,
			"message": "A company tax profile entry is required.",
			"description": "The tax profile should contain a '-0-' file with the company model you wish to import.",
			"faultCode": "Client",
			"helpLink": "",
			"severity": "Error"

This indicates that the import tax profile request is missing a company model and a company tax profile. When importing a tax profile, the request must include a company model with a company tax profile.

Note also that the Tax Profile Import API is only available to Technical Support Administrator roles.